Final answer:
The total cost of 4 sweaters after a 10% markup, with each sweater originally priced at AED 70, is AED 308.
Step-by-step explanation:
To calculate the total cost of 4 sweaters after a 10% markup, where the original price of one sweater is AED 70, we can use the given expression 4(j+0.1j) where j represents the price of one sweater. First, we simplify the expression:
4(j + 0.1j) = 4(1j + 0.1j) = 4(1.1j) = 4.4j
Since the original price of one sweater (j) is AED 70, we substitute this value into our simplified expression:
4.4j = 4.4 * 70 = 308
Therefore, the total cost for the 4 sweaters after a 10% markup is AED 308.